//
//  BPScreenImage.m
//  BPScreenManager_Example
//
//  Created by SiYugui on 2020/4/30.
//  Copyright © 2020年 xuhongji. All rights reserved.
//

#import "BPScreenImage.h"

@implementation BPScreenImage

+ (UIImage *)currentScreenImage{
    
    CGSize imageSize = CGSizeZero;
    // 屏幕方向/尺寸
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    
    //判断设备方向
    if (UIInterfaceOrientationIsPortrait(orientation)){
        imageSize = [UIScreen mainScreen].bounds.size;
    }else{
        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    }
    
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [[UIApplication sharedApplication] windows]){
        
        CGContextSaveGState(context);
        CGContextTranslateCTM(context, window.center.x, window.center.y);
        CGContextConcatCTM(context, window.transform);
        CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
        
        if (orientation == UIInterfaceOrientationLandscapeLeft){
            CGContextRotateCTM(context, M_PI_2);
            CGContextTranslateCTM(context, 0, -imageSize.width);
        } else if (orientation == UIInterfaceOrientationLandscapeRight){
            CGContextRotateCTM(context, -M_PI_2);
            CGContextTranslateCTM(context, -imageSize.height, 0);
        } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
            CGContextRotateCTM(context, M_PI);
            CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
        }
        
        if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]){
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        }else{
            [window.layer renderInContext:context];
        }
        
        CGContextRestoreGState(context);
    }
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}
@end
